Dose level 1 (LOW) for 2 hours (h) Dose level 2 (MEDIUM)for 2 hours Dose level 3 (HIGH)for 2 hours PK and tolerability observation at dose level 3, 2 or 1 will be continued for 18 hours in order to end up with a total infusion period of 24 h Post-infusion follow-up (FU)for 6 hours after infusion termination